51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
#include "geometryutils.h"
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#include <QRect>
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namespace service
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{
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namespace geometry
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{
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QPoint cornerAtPoint(const QPoint &corner, const QSize &size,
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const QRect &boundRect)
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{
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auto clamped = corner;
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if (!boundRect.contains(clamped)) {
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const auto x = std::clamp(clamped.x(), boundRect.left(), boundRect.right());
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const auto y = std::clamp(clamped.y(), boundRect.top(), boundRect.bottom());
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clamped = QPoint(x, y);
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}
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const auto zeroCorner = clamped - boundRect.topLeft();
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const auto boundWidth = boundRect.width();
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const auto boundHeight = boundRect.height();
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QPoint result;
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if (boundWidth <= size.width()) { // not fits
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result.rx() = 0;
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} else if (boundWidth - zeroCorner.x() >= size.width()) { // enough on right
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result.rx() = zeroCorner.x();
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} else if (zeroCorner.x() >= size.width()) { // enough on left
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result.rx() = zeroCorner.x() - size.width() + 1;
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} else { // not enough on both sides
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result.rx() =
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zeroCorner.x() >= boundWidth / 2 ? 0 : boundWidth - size.width() + 1;
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}
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if (boundHeight <= size.height()) {
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result.ry() = 0;
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} else if (boundHeight - zeroCorner.y() >= size.height()) {
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result.ry() = zeroCorner.y();
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} else if (zeroCorner.y() >= size.height()) {
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result.ry() = zeroCorner.y() - size.height() + 1;
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} else {
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result.ry() =
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zeroCorner.y() >= boundHeight / 2 ? 0 : boundHeight - size.height() + 1;
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}
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return result + boundRect.topLeft();
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}
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} // namespace geometry
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} // namespace service
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